Numerical solution vs Analytical solution

[mfduqued]

Hi community,

I have a system equations 8x8, which I find its analytical solution with a approximation. I want solved numerically this system 8x8, but without this approximation. But I compare the analytical solution to numerical with approximation, and they aren't same. I used the command

linearsolve

this command has a error?, How many?

Thank you for your help and colaboration

mfduqued

[f.kohlhepp]

Mauricio Fabian Duque Daza wrote:

Hi community,

I have a system equations 8x8, which I find its analytical solution with a approximation. I want solved numerically this system 8x8, but without this approximation. But I compare the analytical solution to numerical with approximation, and they aren't same. I used the command

linearsolve

this command has a error?, How many?

Thank you for your help and colaboration

mfduqued

Your command is requiring a linear method for solution, some problems will not be solved using linear methods. Try a solve block; if "Find" does not produce a solution, try "Minerr."

[mfduqued]

Thank you for your time, How do I try solve a block?

[f.kohlhepp]

Look up solve blocks in Mathcad help

[RichardJ]

Exactly what are you comparing to what? It's not at all clear in your worksheet.

[jeanGiraud]

>I have a system equations 8x8, which I find its analytical solution with a approximation<

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I won't trust that for a dime !

1. Check for reducing the system to symbolic solutions

2. NON-linear systems solve by Given/Find .

Levenberg-Marquardt is the general NL solver .

3. Watch for all sorts of culprits !